Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, #08-03, 138634, Singapore.
School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Blk N4.1, 639798, Singapore.
Nanoscale. 2017 Jan 5;9(2):774-780. doi: 10.1039/c6nr08870h.
High performance catalysts for the oxygen evolution reaction (OER) are in demand to improve the re-chargeability of Zn-air batteries. In this work, atomically dispersed NiMn layered double hydroxides are prepared via simple hydrothermal synthesis and tested as the OER catalyst in rechargeable Zn-air batteries. NiMn layered double hydroxides with the optimized Ni : Mn molar feeding ratio have good crystallinity, big interlayer spacing, and large surface area, which are beneficial to enhance their catalytic activity. They are highly active and stable during the OER, showing an overpotential of 0.35 V, a Tafel slope of 40 mV dec, and remarkable stability during 16 h of a chronopotentiometry test. Rechargeable Zn-air batteries with NiMn layered double hydroxides as the OER catalyst exhibit a low charge voltage of ≈2 V which is stable for up to 200 cycles. This study illustrates a platform to enhance the catalytic activity of the OER catalyst via fine-tuning the composition and physical properties of the materials and their application for rechargeable metal-air batteries.
高性能的氧气析出反应（OER）催化剂对于改善锌空气电池的可再充电性是有需求的。在这项工作中，通过简单的水热合成制备了原子分散的 NiMn 层状双氢氧化物，并将其作为可再充电锌空气电池中的 OER 催化剂进行了测试。具有优化的 Ni:Mn 摩尔进料比的 NiMn 层状双氢氧化物具有良好的结晶度、大的层间距和大的表面积，这有利于提高其催化活性。它们在 OER 过程中表现出很高的活性和稳定性，过电势为 0.35 V，塔菲尔斜率为 40 mV dec，在恒电流测试 16 小时期间表现出显著的稳定性。以 NiMn 层状双氢氧化物作为 OER 催化剂的可再充电锌空气电池表现出低的充电电压 ≈2 V，稳定循环长达 200 次。这项研究说明了通过精细调整材料的组成和物理性质以及它们在可再充电金属空气电池中的应用来提高 OER 催化剂的催化活性的平台。
